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utils.go
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/
utils.go
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package rod
import (
"bytes"
"context"
"encoding/json"
"fmt"
"path/filepath"
"reflect"
"regexp"
"time"
"github.com/go-rod/rod/lib/cdp"
"github.com/go-rod/rod/lib/proto"
"github.com/ysmood/kit"
)
// Array of any type
type Array []interface{}
// ArrayFromList converts a random list into Array type
func ArrayFromList(list interface{}) Array {
arr := Array{}
val := reflect.ValueOf(list)
for i := 0; i < val.Len(); i++ {
arr = append(arr, val.Index(i).Interface())
}
return arr
}
// SprintFnThis wrap js with this, wrap function call if it's js expression
func SprintFnThis(js string) string {
if detectJSFunction(js) {
return fmt.Sprintf(`function() { return (%s).apply(this, arguments) }`, js)
}
return fmt.Sprintf(`function() { return %s }`, js)
}
// CancelPanic graceful panic
func CancelPanic(err error) {
if err != nil && err != context.Canceled {
panic(err)
}
}
// Event helps to convert a cdp.Event to proto.Payload. Returns false if the conversion fails
func Event(msg *cdp.Event, evt proto.Payload) bool {
if msg.Method == evt.MethodName() {
err := json.Unmarshal(msg.Params, evt)
return err == nil
}
return false
}
func isNilContextErr(err error) bool {
if err == nil {
return false
}
cdpErr, ok := err.(*cdp.Error)
return ok && cdpErr.Code == -32000
}
func matchWithFilter(s string, includes, excludes []string) bool {
for _, include := range includes {
if regexp.MustCompile(include).MatchString(s) {
for _, exclude := range excludes {
if regexp.MustCompile(exclude).MatchString(s) {
return false
}
}
return true
}
}
return false
}
func saveScreenshot(bin []byte, toFile []string) error {
if len(toFile) == 0 {
return nil
}
if toFile[0] == "" {
toFile = []string{"tmp", "screenshots", fmt.Sprintf("%d", time.Now().UnixNano()) + ".png"}
}
return kit.OutputFile(filepath.Join(toFile...), bin, nil)
}
func ginHTML(ctx kit.GinContext, body string) {
ctx.Header("Content-Type", "text/html; charset=utf-8")
_, _ = ctx.Writer.WriteString(body)
}
func mustToJSONForDev(value interface{}) string {
buf := new(bytes.Buffer)
enc := json.NewEncoder(buf)
enc.SetEscapeHTML(false)
kit.E(enc.Encode(value))
return buf.String()
}
// detect if a js string is a function definition
var regFn = regexp.MustCompile(`\A\s*function\s*\(`)
// detect if a js string is a function definition
// Samples:
//
// function () {}
// a => {}
// (a, b, c) =>
// ({a: b}, ...list) => {}
func detectJSFunction(js string) bool {
if regFn.MatchString(js) {
return true
}
// The algorithm is pretty simple, the braces before "=>" must be balanced.
// Such as "foo(() => {})", there are 2 "(", but only 1 ")".
// Here we use a simple state machine.
balanced := true
last := ' '
for _, r := range js {
if r == '(' {
if balanced {
balanced = false
} else {
return false
}
}
if r == ')' {
if balanced {
return false
}
balanced = true
}
if last == '=' && r == '>' {
if balanced {
return true
}
return false
}
last = r
}
return false
}